A growth on the testicle may be a normal epididymal head, or it may be caused by epididymitis, testicular cyst, or testicular tumor. The epididymal head is located on top of the testicle, it is round, it is a normal physical structure, and it usually does not have any sensation, and sometimes the bag that you feel may be a normal epididymal head. Epididymitis can lead to an inflammatory lump in the testicle, which can be accompanied by redness, swelling and pain in the testicle. Testicular cysts are usually cystic structures of the testicle and usually have no symptoms, but if the cyst is large, it can be painful and uncomfortable. If a tumor develops in the testicle, a testicular mass can be palpated and the testicle can become locally hardened. Therefore, feel the testicle on the bag is recommended to visit the hospital, improve the ultrasound of the testicle in order to clarify the specific cause of the disease, and then promptly give appropriate treatment.